Improve error handling in the process library.

runtime/bin/main.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/file.h"
 #include "bin/globals.h"
 #include "bin/process_script.h"
@@ skipping 206 matching lines @@
                              Dart_NewString("main"),
                              0,
                              NULL);
 
   if (Dart_IsValidResult(result)) {
     Dart_Handle result_obj = Dart_GetResult(result);
     if (Dart_ExceptionOccurred(result_obj)) {
       // Print the exception object.
       fprintf(stderr, "An unhandled exception has been thrown\n");
       Dart_Result exception_result = Dart_GetException(result_obj);
-      assert(Dart_IsValidResult(exception_result));
+      ASSERT(Dart_IsValidResult(exception_result));
       PrintObject(stderr, Dart_GetResult(exception_result));
       // Print the stack trace.
       Dart_Result stacktrace = Dart_GetStacktrace(result_obj);
-      assert(Dart_IsValidResult(stacktrace));
+      ASSERT(Dart_IsValidResult(stacktrace));
       PrintObject(stderr, Dart_GetResult(stacktrace));
       fprintf(stderr, "\n");
       Dart_ExitScope();
       Dart_ShutdownIsolate();
       return 255;  // We had an unhandled exception, hence indicate an error.
     }
   } else {
     fprintf(stderr, "%s\n", Dart_GetErrorCString(result));
     Dart_ExitScope();
     Dart_ShutdownIsolate();
     return 255;  // Indicates we encountered an error.
   }
   // Keep handling messages until the last active receive port is closed.
   result = Dart_RunLoop();
   if (!Dart_IsValidResult(result)) {
     fprintf(stderr, "%s\n", Dart_GetErrorCString(result));
     Dart_ExitScope();
     Dart_ShutdownIsolate();
     return 255;  // Indicates we encountered an error.
   }
   Dart_ExitScope();
   // Dump symbol information for the profiler.
   DumpPprofSymbolInfo();
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   return 0;
 }